Banca de DEFESA: CAROLINA PEREIRA SATHLER PAIXAO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CAROLINA PEREIRA SATHLER PAIXAO
DATE: 20/04/2023
TIME: 14:00
LOCAL: Plataforma do Google meet
TITLE:

Analysis of the environmental vulnerability to soil erosion in the rio Branco-RO hydrographic basin

KEY WORDS:

Rondônia; Hydrographic basin; Land use and land cover; Morphodynamics; Vulnerability to erosion.

PAGES: 105
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geografia Física
SPECIALTY: Geomorfologia
SUMMARY:

The aim of this work is to study the Rio Branco Hydrographic Basin (BHRB), which is part of the Amazonian morphoclimatic domain, located in the Guaporé river basin, in the southwestern region of the state of Rondônia, in the border zone with Bolivia. The general objective of the research was to analyze the indices of vulnerability to soil erosion in the BHRB, for planning and environmental management purposes; as specific objectives, it was established: to map the current land use and coverage; identify and map natural and environmental vulnerability to erosion; characterize the relationship between environmental vulnerability to erosion and economic aspects of the region; compare the BHRB environmental vulnerability spatialization with the planning and classification of the Socioeconomic Ecological Zoning of the state of Rondônia (ZSEE-RO). To spatialize the basin's degrees of natural and environmental vulnerability, there were used the method proposed by Crepani et al. (2001) and the Multicriterial Analystic Hierarchy Process, (AHP). The vulnerability analysis was anchored on the RADAMBRASIL database for geology, pedology and vegetation themes; PLANAFLORO, for climate; MapBiomas, for land use and land cover mapping, using the 6.0 Collection, referring to the year 2020. The results indicate that: a) in mapping land use and land cover, natural vegetation areas predominate (71%), with landscapes formed, in the majority, by dense forest cover; in anthropized areas (28%), pasture is the main cover; ranching is the main economic activity in the region, responsible for altering the landscape; b) in mapping natural vulnerability to erosion, it was found that 61.4% of the BHRB is moderately stable; 30.48% is moderately stable/vulnerable; 6.38% presents moderate natural vulnerability to modelling processes of the relief; the areas with greater stability have the presence of native vegetation with greater density, flattened surfaces and well-developed soils; c) in mapping of environmental vulnerability to erosion, adding the anthropic element to the mapping of the current land surface cover, the moderately stable class decreased to 47.77%; the medium stable/vulnerable areas did not undergo much change, occupying 30.27%; the moderately vulnerable area increased to 21.95% of the BHRB. From the systemic analysis of the landscape, it was observed that the change in land cover was the dominant factor affecting vulnerability to soil erosion. Therefore, the protected areas that make up the BHRB are essential for the conservation of natural landscapes, which can ensure greater morphodynamic stabilization. From this analysis, it was concluded that: the areas that did not have their use protected had their vegetation cover altered, as a result of the intense occupation process, coupled with economic exploration and activities; ZSEE-RO was essential for the conservation of natural landscapes and directly influenced the reduction of areas vulnerable to erosive processes, as this instrument managed to restrict, in most of the BRHB's territory, the use of areas with greater morphodynamic instability, which could have their vulnerability increased in the process of territorial occupation and economic exploration.

COMMITTEE MEMBERS:
Presidente - 2313615 - MICHEL WATANABE
Interno - 396929 - DORISVALDER DIAS NUNES
Externo à Instituição - ANDERSON VOLPATO SCCOTI - UFSM